The Cressi Nano Black MIrrored Mask is designed to offer an extremely hydrodynamic and compact shape to help divers cut through the water and aid movements in small spaces. The low volume of this mask makes it ideal for freediving and spearfishing, as well as hydrodynamically adequate for scuba diving. The Cressi Nano Black Mirrored Mask is designed to offer an extremely hydrodynamic and compact shape to help divers cut through the water and aid movements in small spaces. The low volume of this mask makes it ideal for freediving and spearfishing, as well as scuba diving.